public IActionResult CreateAuthorCollection([FromBody] IEnumerable <AuthorCreateDTO> authors)
{
if (authors == null)
{
return(BadRequest());
}
var entities = Mapper.Map <AuthorCreateDTO, Author>(authors).ToList();
AuthorsService.AddRange(entities);
var model = Mapper.Map <Author, AuthorDTO>(entities);
var ids = entities
.Select(p => p.Id.ToString())
.Aggregate((i, j) => $"{i},{j}");
return(CreatedAtRoute(nameof(GetAuthorsCollection), new { ids }, model));
}